The correct option is C All of the above
Anatomy is the study of internal structure of plants.
The anatomy of a plant varies with habitat of the plant.
For example : Hydrophytes that grow in wet places or in aquatic habitats have leaves with thin cuticle and certain parts have air spaces (aerenchyma) to provide buoyancy.
Different organs of plants have distinct internal structures or arrangement of tissues. For example leaves, stem and roots have different anatomical structures. The anatomy of leaf is well adapted for photosynthesis whereas the anatomy of root is adapted for absorption.